摘要
研究延性金属环在动态加载下的断裂应变分布规律具有重要意义,电磁膨胀环装置是常用的实验加载手段。然而,目前实验上缺乏有效的原位观测技术,无法获得高精度的断裂应变统计数据。为此,将新研制的密排光子多普勒测速仪阵列应用于电磁膨胀环实验,获得了大量高置信度的断裂应变实验数据;通过硬度测量获得了材料屈服强度的统计分布规律,建立了含概率的本构模型,并进行了大规模计算,得到了大量的断裂应变模拟结果。结合实验与模拟结果,分析了6061铝电磁膨胀环动态断裂应变的应变率效应以及断裂应变韦伯分布假设的合理性。
The fracture strain distribution of ductile metal rings under dynamic loading has significant application value,and the electromagnetic expansion ring is a commonly used experimental loading method.However,currently there is a lack of effective in-situ observation technology in experiments,making it impossible to obtain high-precision fracture strain statistical data.In this paper,the newly developed closepacked photonic Doppler velocimetry(PDV)array testing technology was applied to the electromagnetic expanding ring experiment,and a large amount of high-confidence fracture strain experimental data were obtained.The statistical distribution of material yield strength was obtained through hardness measurements,a probabilistic constitutive model was established,and large-scale computations were carried out to obtain a wealth of fracture strain simulation results.By combining experiments with simulations,the strain rate effect of dynamic fracture strain in 6061 aluminum electromagnetic expanding ring and the rationality of the Weibull distribution assumption for fracture strain were analyzed.
作者
蔡周峰
江燕
张豪
刘明涛
CAI Zhoufeng;JIANG Yan;ZHANG Hao;LIU Mingtao(National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621999,Sichuan,China)
出处
《高压物理学报》
北大核心
2025年第9期93-100,共8页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(12202422,11932018,12072332)。
关键词
密排多普勒测速仪阵列
电磁膨胀环
断裂应变统计规律
应变率效应
close-packed photonic Doppler velocimetry array
electromagnetic expansion ring
statistical law of fracture strain
strain rate effect
